Heat domes trap overnight temperatures too — and millions without air conditioning are facing this week's Eastern U.S. heat wave.

Dangerous heat is expected across large swaths of the U.S. this week, according to the National Weather Service.

A heat wave will blast a large swath of the United States this week. The National Weather Service says temperatures rising ahead of the July 4th holiday will feel hotter because…

Millions across the central and eastern U.S. could face days of triple-digit heat index values.

A heat wave will blast a large swath of the U.S. this week. The National Weather Service says temperatures will feel hotter because of the high humidity that's arriving with it.

A heat wave will blast the eastern United States this week

More than 130 million Americans in southern and Great Plains states were under moderate to severe heat risk over the weekend

Millions of Americans across the eastern half of the US are facing a prolonged stretch of dangerous and potentially record-breaking heat as Americans get set to head outdoors to…

A “heat dome” is expected to bring extremely high temperatures to parts of the country.

A heat dome will push indexes to 115°F across the East this week, arriving along with World Cup matches and America 250 celebrations.

As millions plan to celebrate the Fourth of July outdoors, meteorologists warn temperatures could soar to record-breaking, life-threatening highs.

Millions across the central and eastern United States are bracing for a prolonged and dangerous heatwave this week, with temperatures set to soar ahead of the Fourth of July…

Sweltering conditions are expected to last through the weekend

These unbearably hot and humid summer months are typically made possible by phenomena known as “heat domes.”

These unbearably hot and humid summer months that put millions of people across the globe at risk are typically made possible by phenomena known as heat domes.

A dangerous heatwave is set to engulf large parts of the central and eastern United States from Tuesday through the July 4 holiday weekend. Forecasters have warned of extreme…

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Meteorologist Ryan Maue described it as a "mega heat dome" ...

A prolonged, intense heat wave will make temperatures feel as hot as 115 degrees Fahrenheit in the eastern U.S. this week

Heat domes trap overnight temperatures too — and millions without air conditioning are facing this week's Eastern U.S. heat wave.

Sweltering conditions are expected to last through the weekend